prolonged Q-T interval

例句：

1. 1.The patient's prolonged Q-T interval may indicate a risk for sudden cardiac death.
   患者的延长Q-T间期可能表明有猝死的风险。
2. 2. The study found that the prolonged Q-T interval could be a sign of underlying heart disease.
   研究发现，延长的Q-T间期可能是潜在心脏病的迹象。
3. 3.The doctor ordered an electrocardiogram to check the patient's prolonged Q-T interval.
   医生要求进行心电图检查，以检查患者的延长Q-T间期。